body {
    padding:0px;
    margin: 0px;
    font-family: arial, helvetica, sans-serif;
    background-color: #F3F3F3;
    background-image: url("../images/bg_header.png") ;
    background-position: top center;
    background-repeat: no-repeat;
}
li{
    list-style-type: none;
}
.header{
    margin: 0px auto;
    width:1000px;
    height:600px;

}
.main{

}
.footer{
    margin: 0 auto;
    width: 1000px; height: 200px;
    background: url("../images/bg_footer.png") no-repeat bottom center;
}